Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Holmium is a relatively soft and malleable silvery-white metal. The chemical symbol for Chlorine is Cl. The chemical symbol for Xenon is Xe. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). The nucleus consists of 27 protons (red) and 32 neutrons (blue). The chemical symbol for Cerium is Ce. Francium is an alkali metal, that has one valence electron. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure.    Noble Gases Element Cobalt (Co), Group 9, Atomic Number 27, d-block, Mass 58.933. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure.    Name The chemical symbol for Neptunium is Np. Hassium is a chemical element with symbol Hs and atomic number 108. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Cobalt, metallic chemical element, one of the transition elements, atomic number 27. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. We are committed to providing the highest level of customer service. The chemical symbol for Radium is Ra. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure.The chemical symbol for Cobalt is Co. Atomic Mass of Cobalt. The chemical symbol for Caesium is Cs. is a rare earth element with a metallic silver luster. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. cobalt 57 a radioisotope of cobalt, atomic mass 57, having a half-life of 270 days; used as a label for cyanocobalamin. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. The chemical symbol for Hafnium is Hf. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. The unit of measure for mass is the atomic mass unit (amu). Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Radioactive 60 Co is used in the treatment of cancer. There is only one stable isotope of cobalt, which has an atomic weight of 59. Cobalt is widely present on the earth crust, in combination with other minerals and in natural water.    Atomic Number Cobalt (Co). It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Because of its high chemical reactivity, barium is never found in nature as a free element. Astatine is the rarest naturally occurring element on the Earth’s crust. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil.    Other Metals Cobalt was first discovered in 1735 by George Brandt in Stockholm Sweden. Chlorine is a yellow-green gas at room temperature. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Helium is He. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. The chemical symbol for Dysprosium is Dy. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. The chemical symbol for Holmium is Ho. The metal is used especially for heat-resistant and magnetic alloys. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. 1) You may use almost everything for non-commercial and educational use. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. The chemical symbol for Einsteinium is Es.    Date of Discovery Cobalt (Co) is a bluish-white metal that has the atomic number 27 in the periodic table. Cobalt is a naturally-occurring element that has properties similar to those of iron and nickel.    Number of Neutrons Cobalt is also used in samarium-cobalt permanent magnets. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. The chemical symbol for Bromine is Br. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. In nuclear reactors, promethium equilibrium exists in power operation. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. The atomic number of cobalt is 27 and it is indicated by symbol is Co. Cobalt is a ferromagnetic. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. The chemical symbol for Zirconium is Zr. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. The chemical symbol for Uranium is U. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Marmite, which we eat here in England and love it or hate it is a source of vitamin B 12, actually a cobalt complex. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. On the other hand, titanium is a chemical element having the symbol Ti and atomic number 22. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. It has an estimated density of 40.7 x 103 kg/m3. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. The chemical symbol for Mendelevium is Md. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. This page was created by Yinon Bentor. Chemically, indium is similar to gallium and thallium. The chemical symbol for Cobalt is Co.. Atomic Mass of Cobalt. Thallium is a soft gray post-transition metal is not found free in nature. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.